Materials Needed

textbook models of animal mitosis microscope slides of whitefish mitosis ( blastula) compound microscope

For Demonstration:

microscope slide of human chromosomes from leukocytes in mitosis oil immersion objective

The cell cycle consists of the series of changes a cell undergoes from the time it is formed until it reproduces. Interphase, mitosis, cytoplasmic division, and differentiation are stages of a cell cycle. Typically, a newly formed cell grows to a certain size and then divides to form two new cells (daughter cells). This reproductive process involves two major steps: (1) division of the cell's nuclear parts, which is called mitosis (karyokine-sis) and (2) division of the cell's cytoplasm (cytokinesis). Before the cell divides it must synthesize biochemi-cals and other contents. This period of preparation is called interphase. The extensive period of interphase is divided into three phases. The S phase when DNA synthesis occurs is between two gap phases (Gj and G2) when cell growth occurs and cytoplasmic organelles duplicate.

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